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prenotching
n
expl.
预开V形槽
用机械工具、线性聚能药包或喷水枪进行开槽的作业。沿炮孔径向两侧开槽,目的在于降低破碎所需的炮孔压力。因此,形成相邻炮孔径向裂隙所需的炮孔压力下降,从而减轻因爆破振动而对周围岩石产生的破坏
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